• Journal of the Korea institute for structural maintenance and inspection
• /
• v.8 no.4
• /
• pp.265-273
• /
• 2004

As a result of compressive strength experiment, rupture compressive strength showed more increases in specimens of 15% and 20% of Cockle shells in those of non-mixture. The specimen which was used general aggregate showed the highest value and ductility capacity was getting decreased as the amount of cockle shell was getting increased in the ductility capacity of specimen. We might conclude that the reason of the yield strength's decline was the lack of the bond strength which was caused by the amount of cockle shell.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.10 no.2
• /
• pp.159-165
• /
• 2000

This study was investigated the environment of waste shells such as oyster, cockle and paphia on southern shore in korea and established the recycling method to prevent the environmental pollution, etc. The waste shells were reclaimed at public shore illegally or leaved on the surroundings of shore. The origin mechanism, XRD and TG-DTA analyses were performed to effective recycling of waste shells, and the optimal recycling method was preparation of the calcium carbonate. In this work, calcium carbonate and lime fertilizer of granular shape were prepared using the waste shell.

• Journal of the Korea Institute of Building Construction
• /
• v.5 no.2 s.16
• /
• pp.139-146
• /
• 2005

As a result of compressive strength, specimens having mixture rate of cockle shells of $15\%\;and\;20\%$ showed more increases of compressive strength than non-mixture specimens as age increases. Ductility capacity of specimens was higher in specimens mixing cockle shells than in specimens using general fine aggregates and specimen of $10\%$ of cockle shells was highest in ductility capacity. To sum up all experimental results, ductility capacity of specimen without shear reinforcement using mixture of cockle shell was higher than non-mixture specimen and it is considered that mixture of cockle shells up to $20\%$ as fine aggregate for concrete will be available. Continuous researches on durability, workability and economy of crushed cockle shells used for substitute fine aggregate of concrete will be needed.

• Journal of the Korea Institute of Building Construction
• /
• v.4 no.2
• /
• pp.89-95
• /
• 2004

1) As result of specimen with shear reinforcing bar of reinforced concrete beam, ductile coefficient of specimen was high in specimen containing Cockle shells based on non-mixed specimen. In increase rate of specimens, yield strength was similar in specimens containing Cockle shells and non-mixed specimens and maximum strength was higher in specimen containing Cockle shells. 2) To sum up the above experimental results, it is found that using splitted Cockle shells as aggregate for concrete by 10%～ 15% showed the same or higher compressive strength and shear strength as concretes using general aggregate and it can be used as substitute aggregate of concrete. It is considered that for future use of splitted Cockle shells as substitute concrete aggregate, continuous researches of its durability, applicability and economy are needed.

• Journal of the Korea Institute of Building Construction
• /
• v.4 no.1
• /
• pp.141-146
• /
• 2004

1) As a result of compressive strength experiment, rupture compressive strength showed more increases in specimens of 15% and 20% of Cockle shells in those of non-mixture. Comparing compressive strength between no-mixed Specimens and Specimens of containing Cockle shells, Specimens containing Cockle shells showed higher strength in 60 days and 90 days of age, and as ark Cockle is contained and age is elapsed, compressive strength is also increased In addition, estimation of compressive strength by reactive hardness in concrete using Cockle shells as aggregate shows low reliability. 2) As a result of experimenting compressive strength after heating, Specimens containing Cockle shells and non-mixed Specimens showed similar strength at $200^{\circ}C$, but compressive strength was lowered as content of Cockle shells increased at over $400^{\circ}C$ and heating temperature was higher. It is because Cockle shells was fired by heat and then its adhesion and bonding capacity were lost. 3) To sum up the above experimental results, it is found that using splitted Cockle shells as aggregate for concrete by 10%~20% showed the same or higher compressive strength and shear strength as concretes using general aggregate and it can be used as substitute aggregate of concrete. It is considered that for future use of splitted Cockle shells as substitute concrete aggregate, continuous researches of its durability, applicability and economy are needed.

• Resources Recycling
• /
• v.6 no.3
• /
• pp.28-35
• /
• 1997

Adsorption properities of hcavy metals (Cd, Cu, Fe, Mn, Pb, Zn) and organic compounds (Trichloroethylene and T Tetrachroethy len려 on sh$\xi$1I( oyster and ark shell) were investigated using wat$\xi$r treatment matenals, The shell powder (m띠or C crystal structurc is calcium hydroxide) showed the preference adsorption for heavy metals in order of Mn > Zn > Fe > Cd > eu > P Pb. The high removal capacities of heavy metals arc helicved to be largely due to precipitation by foonation of metal c carhonat,잃 and hydroxides at high pH caused by the $Ca(OH)_2$ component of sl1ell, immobilizatIon of heavy metals in a solid I matrix by calcium‘ and fixation by insoluble organic materials in the oystcr and ark shell. The use of sh려I in water treatment h has the potential to bc benefIcial as a source of inexpensive matcrials‘ moreover, not only treatment of waste but also e environmcntal business including environmental-purification ceramics could be better off by utili낌ng high-valued waste and d developed puri'fication ceramics and media.